Adsorptive behavior of Ni (II) on phosphoethanolamine functionalized titanium dioxide

摘要

Nickel has been identified as an environmental toxin and occupational pollutant leading to infertility, birth defects, and nervous system defects. That is why the adsorption of Ni (II) from aqueous solutions by functionalized nano powders of titanium dioxide was studied. The surface of adsorbent was functionalized using phosphoethanolamine and characterized. The maximum adsorption of Ni (II) was observed to occur at pH 6.0 in 90 minutes. Kinetic experimental data were fitted well by the pseudo-second-order model. According to the equilibrium data, Ni (II) adsorption was well described by Langmuir isotherm model. According to the evaluated thermodynamic parameters, the adsorption was a spontaneous (?G 0) process. The presence of interfering cations (Mg and Ca) with a concentration of 50 mg g~(–1) caused no considerable lowering effect on the Ni (II) adsorption. Regeneration of adsorbent was performed using HNO_(3) (0.1 mol L~(–1)).